Carpetsahib,
Thanks for the heads-up but I'm not quite sure I understand exactly what you are saying happened. I don't fully understand WHAT broke off WHERE and how did it lock the bolt from opening. I don't understand what you mean by 'bending moment' as the striker/firing pin works either forward or rearward or axially and never bends. At the moment of firing the firing pin is in it's most forward position and does not in any way lock the bolt that I can see.